High-frequency coil having a synthetic resin base

ABSTRACT

A small high frequency coil having a synthetic resin base with a plurality of parallel grooves which extend to the lower surface of the base and to one side face thereof. Each groove contains a wire-shaped connecting contact with a portion thereof embedded in the base whereas a second portion is partly contained within the groove and protrudes from said one side face. The second portion of the wire-shaped contact is adapted to be bent at right angles to a position in which it protrudes from the lower surface of the base. The coil can be conveniently mounted on a printed circuit board with the coil axis either parallel or perpendicular to the board.

. 3,265,999 3,496,505 2/1970 Johannsen ..336/192X United States Patent1191 Heijnen et al.

, 1 HIGH-FREQUENCY COIL HAVING A SYNTHETIC RESIN BASE [75] Inventors:Alphonsus Jozephus Cornelus Heiinen; Hendrikus Wilhelmus Antonius vanOorschot, both of Emmasingel, Eindhoven, Netherlands [73] Assignee: U.S.Philips York, N.Y.

[22] Filed: May 11, 1971 [211 Appl.No.: 142,212

Corporation, v New [58] Field of Search ..336/65, 192, 198, 208, 136

A [56] References Cited UNITED STATES PATENTS 8/1966 Kessel ..336/192Schmitz ..336/65 X LaPatka et al ..336/198 X FOREIGN PATENTS ORAPPLICATIONS 10/1966 Germany ..336/192 9/1948 Great Britain ..336/192Primary Examiner--Thomas J. Kozma Attorney-Frank R. Trifari [57]ABSTRACT A small high frequency coil having a synthetic resin base witha plurality of parallel grooves which extend to the lower surface of thebase and to one side face thereof. Each groove contains a wire-shapedconnecting contact with a portion thereof embedded in the base whereas asecond portion is partly contained within the groove and protrudes fromsaid one side face. The second portion of the wire-shaped contact isadapted to be bent at right angles to a position in which it protrudesfrom the lower surface of the base. The coil can be conveniently mountedon a printed circuit board with the coil axis either parallel orperpendicular to the board.

9 Claims, 3 Drawing Figures HIGH-FREQUENCY COIL HAVING A SYNTHETIC RESINBASE This invention relates to a high-frequency coil having a base madeof synthetic resin and wire-shaped connecting contacts which also servefor mounting on a printed-circuit board. The object of the invention isto provide a construction which is suitable for inexpensive seriesmanufacture and which can be mounted on a printed-circuit board with thecoil axis both parallel to and perpendicular to said board.

According to the invention we provide a high frequency coil with awinding supported on the upper side of a base of synthetic resin havingtwo opposite side faces and being provided with wire-shaped connectingcontacts which also serve for mounting the base on a printed circuitboard. In accordance with the desired mounting position, the portionsserving as soldering tags may be straight or may be bent at rightangles. The length and depth of the grooves are preferably chosen suchthat the wire-shaped connecting contacts contained therein protrudeequally far from the base, both in the straight condition and in thecondition where they are bent at right angles around the material of thebase.

In order that the invention may be readily carried into effect, oneembodiment thereof will now be described in detail, by way of example,with reference to the accompanying drawing, in which:

FIG. 1 is a side elevation and partly a vertical crosssectional view ofone embodiment, and

FIGS. 2 and 3 are another side elevation and a horizontalcross-sectional view, respectively, of the same device.

In a plan view (FIG. 3) the high frequency coil shown has a rectangularinsulating base 1 made of synthetic resin which is provided at the lowerside with generally parallel grooves 3 which extend perpendicular to theleft-hand side face 4 (FIG. 1) of the base, their open left-hand endsterminating in this face. In the righthand direction in FIG. 1 thegrooves 3 terminate within the base 1. The coil has a number ofwire-shaped connecting contacts 5 which are embedded into the materialof the base 1 over a portion of their length. The embedded portion 5a ofeach of the contacts 5 is situated in line with the bottom portion(upper portions in FIGS. 1 and 2) of one of the grooves 3.

The coil is preferably manufactured with straight connecting contacts 5,as shown in FIG. 1, for mounting on a printed-circuit board engaging theleft-hand side face 4 of the base. However, by using a suitable bendingjig, it is readily possible to bend the portions 5b of the contacts 5,situated to the left of the embedded portions 50 in FIG. 1, around thematerial portion of the base 1, denoted by reference numeral Ia, atright angles for mounting as a soldering tag on a horizontalprinted-circuit board 7 (denoted by broken lines in FIG. 1), as shown inbroken lines by the bent-over position 50. The depth and the length ofeach of the grooves 3 is chosen such that the connecting contact 5protrudes in both positions approximately equally far i.e. over the mostsuitable length for mounting outside the base 1. The width of the groove3 is approximately equal to the thickness of the connecting contact 5 sothat the contact, which is bent at right angles, is a tight fit. andcannot pivot around the embedded portion 5a.v

The straight end (FIG. 1) of the contact portion 5a protrudes outsidethe base 1 from the side face of the base 1 opposite to side face 4, andserves as a connecting point for one or more wire lead-outs 9 of thecoil winding 11. This winding (not shown in the FIGS. 2 and 3) isaccommodated on a coil former 13 extending perpendicular to the base 1and having two flanges l5 and 17, which coil former has been moulded toform an internal unit with the base 1. The edge of the lower flange l7coheres with an elongated elevation 19 which is formed on the base 1above the row of embedded wire portions 5a. Between the flange 17 andthe base I a space is left in which fits one side of a rectangular frame21 of ferrite which is secured, for example, by gluing. This frameserves as a magnetic termination or yoke for the coil and has an opening22 in the lower and in the upper side to allow passage of a preferablysmooth cylindrical ferrite pin 21, which serves as an adjustable corefor the coil. This pin is rotatable and vertically displaceable withsome friction inside the former 13, as a resilient tag 25 is formed onthe inside thereof which resiliently engages the pin 23. Thedisplacement may be effected by a helical movement imparted to the corepin by means of a screw-driver engaging into a groove 27 which is formedin a synthetic resin head 29 secured to the upper end of the pin 23.

What is claimed is:

1. A high-frequency coil comprising a winding supported on the upperside of a synthetic resin base member having two opposite side faces andprovided with a plurality of wire-shaped connecting contacts which alsoserve for mounting the base on a printed circuit board, the base of thecoil including a plurality of approximately parallel grooves at thelower side which terminate at one end at one of said two opposite sidefaces, the other end of the grooves being situated inside the base, eachgroove containing a wire-shaped contact with each wire-shaped contacthaving a first portion partly contained within one of said grooves inwhich it is a tight fit and from which it protrudes in part, theprotruding part serving as a soldering tag for making externalconnections whereas the remaining portion of the wire-shaped contactextends in line with the bottom of the groove and is embedded in thematerial of the base with an end portion protruding from the second oneof said two opposite side faces, and the coil winding being connected tosaid protruding end portion.

2. A high-frequency coil as claimed in claim 1, wherein said firstportion of each contact is adapted to be bent into a position at rightangles to said remaining portion and wherein the length and the depth ofthe grooves are chosen such that the tag parts of the wireshapedconnecting contacts contained therein protrude equally far from thebase, both in the straight condition and in the condition where they arebent at right angles around the material of the base.

3. A high-frequency coil as claimed in claim 1 further comprising a coilformer composed of synthetic resin extending perpendicular to the baseand having a pair of flanges, one of said flanges forming an integralunit with the base, around which a ferrite frame which serves as amagnetic yoke is provided, characterized in that the edge of said oneflange of the coil former coheres with an elevation member formed on aportion of the base member so as to provide a space between the oneflange and the coil base, and means securing one sideof the ferriteframe within said space.

4. A high frequency coil as claimed in claim 3 wherein said firstportion of each contact is adapted to be bent'into a position at rightangles to said remaining portion and wherein the length and depth of thegrooves are arranged so that the tag parts of the wireshaped contactsprotrude the same distance from the base in either the straight or bentposition thereof.

5. A high-frequency coil comprising a coil former with a base member formounting the coil to a board and having a pair of opposed side walls, awinding mounted on the coil former with its axis perpendicular to thebase member, a plurality of parallel grooves connecting terminal forsaid winding, said first part of each contact being adapted to be bentinto a position perpendicular to the second part so as to protrude fromsaid bottom surface of the base.

6. A coil as claimed in claim 5 wherein said grooves are dimensioned sothat said one end of the wireshaped contacts protrude substantially thesame distance from the side wall and the bottom surface of the basemember in the in-line and bent positions, respectively, of the contacts.

7. A coil as claimed in claim 6 wherein said coil former extendsperpendicular to the base member and includes a flange that is anintegral unit with the base member and forms a recess with a part of thebase member, and a magnetic yoke frame member with one end locatedwithin said recess.

8. A coil as claimed in claim 6 further comprising a cylindrical ferritecore axially movable within said coil former to adjust the inductance ofthe coil.

9. A coil as claimed in claim 6 wherein said base 'member hasa generallyrectangular shape and is composed of a synthetic resin material.

1. A high-frequency coil comprising a winding supported on the upperside of a synthetic resin base member having two opposite side faces andprovided with a plurality of wire-shaped connecting contacts which alsoserve for mounting the base on a printed circuit board, the base of thecoil including a plurality of approximately parallel grooves at thelower side which terminate at one end at one of said two opposite sidefaces, the other end of the grooves being situated inside the base, eachgroove containing a wire-shaped contact with each wire-shaped contacthaving a first portion partly contained within one of said grooves inwhich it is a tight fit and from which it protrudes in part, theprotruding part serving as a soldering tag for making externalconnections whereas the remaining portion of the wire-shaped contactextends in line with the bottom of the groove and is embedded in thematerial of the base with an end portion protruding from the second oneof said two opposite side faces, and the coil winding being connected tosaid protruding end portion.
 2. A high-frequency coil as claimed inclaim 1, wherein said first portion of each contact is adapted to bebent into a position at right angles to said remaining portion andwherein the length and the depth of the grooves are chosen such that thetag parts of the wire-shaped connecting contacts contained thereinprotrude equally far from the base, both in the straight condition andin the condition where they are bent at right angles around the materialof the base.
 3. A high-frequency coil as claimed in claim 1 furthercomprising a coil former composed of synthetic resin extendingperpendicular to the base and having a pair of flanges, one of saidflanges forming an integral unit with the base, around which a ferriteframe which serves as a magnetic yoke is pRovided, characterized in thatthe edge of said one flange of the coil former coheres with an elevationmember formed on a portion of the base member so as to provide a spacebetween the one flange and the coil base, and means securing one side ofthe ferrite frame within said space.
 4. A high frequency coil as claimedin claim 3 wherein said first portion of each contact is adapted to bebent into a position at right angles to said remaining portion andwherein the length and depth of the grooves are arranged so that the tagparts of the wire-shaped contacts protrude the same distance from thebase in either the straight or bent position thereof.
 5. Ahigh-frequency coil comprising a coil former with a base member formounting the coil to a board and having a pair of opposed side walls, awinding mounted on the coil former with its axis perpendicular to thebase member, a plurality of parallel grooves located in the bottomsurface of the base member and extending perpendicular to the coil axis,said grooves extending from a first one of said side walls to a pointinside the base member, a plurality of wire-shaped contacts each locatedwith a first part in a respective groove and one end protruding fromsaid one side wall for making external connections thereto and a secondpart in line with its respective groove and totally embedded within thebase member with a second end protruding from the other of said sidewalls to provide a connecting terminal for said winding, said first partof each contact being adapted to be bent into a position perpendicularto the second part so as to protrude from said bottom surface of thebase.
 6. A coil as claimed in claim 5 wherein said grooves aredimensioned so that said one end of the wire-shaped contacts protrudesubstantially the same distance from the side wall and the bottomsurface of the base member in the in-line and bent positions,respectively, of the contacts.
 7. A coil as claimed in claim 6 whereinsaid coil former extends perpendicular to the base member and includes aflange that is an integral unit with the base member and forms a recesswith a part of the base member, and a magnetic yoke frame member withone end located within said recess.
 8. A coil as claimed in claim 6further comprising a cylindrical ferrite core axially movable withinsaid coil former to adjust the inductance of the coil.
 9. A coil asclaimed in claim 6 wherein said base member has a generally rectangularshape and is composed of a synthetic resin material.